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1) Open GMail
2) Select your Contacts (or go to Contacts.Google.Com)
3) Select "new group" on the left pane (and give it a name)
4) Select the new group and use the "+" icon at the top to add members to your new group
5) You can now use your new group name to send emails to that group!

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Your only option is to use everyone in the CC field. It's not literally the same, but Yahoo Groups was programmed to be a list-server (send email to list@yahoo.com, and everyone subscribed to it will receive the email). However, this "list server" function is not built-in Gmail.
If you want a similar experience as you had on Yahoo, start a Google Groups, and start inviting people. You will also get a special group email address (xxx@googlegroups.com), and you can send your email there.https://groups.google.com/forum/#!overview